[enum-wg] ENUM motivation

Hello
We are beginning the request phase to the 1.5.3.e164.arpa in Portugal 
and we still have some doubts about the main motivation towards this 
technology, that would be from:

- Traditional Telcos ? No, they want to bill all calls....
- New Telcos ? No, they want to keep their VoIP networks closed...
- IP Telephony integrators (Alcatel, Cisco, Siemens,...)? Maybe... but 
they usually work together with the Telcos
- the end users ? Yes :)

Is this user interest going to be enough?
And are they willing to pay for this registration? They can use free 
ENUM trees....

How can we push for more ENUM registrations in the e164.arpa tree?

Thanks
Joao Pereira
FCCN